void shared_mutex::imp_signal()
{
#ifdef _WIN32
NtReleaseKeyedEvent(nullptr, &m_value, false, nullptr);
#else
m_value += c_sig;
futex(reinterpret_cast<int*>(&m_value.raw()), FUTEX_WAKE_BITSET_PRIVATE, 1, nullptr, nullptr, c_sig);
//futex(reinterpret_cast<int*>(&m_value.raw()), FUTEX_WAKE_BITSET_PRIVATE, c_one, nullptr, nullptr, c_sig - 1);
#endif
}
void cond_variable::imp_wake(u32 _count) noexcept
{
#ifdef _WIN32
// Try to subtract required amount of waiters
const u32 count = m_value.atomic_op([=](u32& value)
{
if (value > _count)
{
value -= _count;
return _count;
}
return std::exchange(value, 0);
});
for (u32 i = count; i > 0; i--)
{
NtReleaseKeyedEvent(nullptr, &m_value, false, nullptr);
}
#elif __linux__
for (u32 i = _count; i > 0; sched_yield())
{
const u32 value = m_value;
// Constrain remaining amount with imaginary waiter count
if (i > value)
{
i = value;
}
if (!value || i == 0)
{
// Nothing to do
return;
}
if (const int res = futex((int*)&m_value.raw(), FUTEX_WAKE_PRIVATE, i > INT_MAX ? INT_MAX : i, nullptr, nullptr, 0))
{
verify(HERE), res >= 0 && res <= i;
i -= res;
}
if (!m_value || i == 0)
{
// Escape
return;
}
}
#endif
}
/**
* Unblocks a wait block.
*
* \param WaitBlock A wait block.
*
* \remarks The wait block is in an undefined state after it is
* unblocked. Do not attempt to read any values from it. All relevant
* information should be saved before unblocking the wait block.
*/
__mayRaise FORCEINLINE VOID PhpUnblockQueuedWaitBlock(
__inout PPH_QUEUED_WAIT_BLOCK WaitBlock
)
{
NTSTATUS status;
if (!_interlockedbittestandreset((PLONG)&WaitBlock->Flags, PH_QUEUED_WAITER_SPINNING_SHIFT))
{
if (!NT_SUCCESS(status = NtReleaseKeyedEvent(
PhQueuedLockKeyedEventHandle,
WaitBlock,
FALSE,
NULL
)))
PhRaiseStatus(status);
}
}
